When it comes to air filters, most replaceable filters for the engine air intake, or spin-on air filters for the air brake system, are likely to be on a regular maintenance list. But what about in-line air filters for the trailer air system?

Intermittent electrical faults can drive a technician to distraction. The story typically goes like this: The vehicle comes in with a trouble code stored in the history, or the driver complains about an electrical component acting up “once in a while.”

Technicians know there can be many risks when working on vehicles. Especially when it comes to medium and heavy trucks, it doesn’t take much to figure out that all those big, heavy parts have the capacity to make your day less than enjoyable.